I want to create a simple countdown timer for 10 minutes. I have figured out how to do this for the most part but with setInterval() it seems to stop with 2 seconds left every time. I have heard that setInterval() can be very unreliable but I don't know what else to do.
I set the timer to 1 minute and the seconds reset to 3 instead of 59 for time-saving purposes with running the code.
const value = document.querySelector("#time");
const startBtn = document.querySelector("#btn-start")
const resetBtn = document.querySelector("#btn-reset");
startBtn.addEventListener('click', function(){
var minute = 1;
var sec = 3;
setInterval(function(){
value.innerHTML = minute + ":" + sec;
sec--;
if(sec < 0){
minute--;
sec = 3;
}
if(sec <=9){
sec = "0" + sec;
}
if(sec == 0 && minute == 0){
alert("DONE!");
location.reload();
}
}, 1000);
});
resetBtn.addEventListener('click', function(){
location.reload();
})#main{
position: relative;
display: flex;
justify-content: center;
align-items: center;
padding: 20px;
height: 100%;
}
.container{
position: relative;
margin-top: 5%;
}
#title{
display: block;
font-family: 'Roboto', sans-serif;
font-size: 50px;
font-weight: 600;
color:rgba(0, 0, 0, 0.83);
margin: 20px auto;
padding: 0;
}
#time{
display: block;
font-family: 'Roboto', sans-serif;
font-size: 70px;
text-align: center;
margin: 20px auto 50px auto;
}
.function-buttons{
position: relative;
display: flex;
flex-direction: row;
justify-content: center;
align-items: center;
}
.reset-btn{
display: block;
font-family: 'Roboto', sans-serif;
font-size: 25px;
width: 150px;
background: #eee;
margin: 0 10px;
padding: 10px 30px;
text-align: center;
border-radius: 5px;
border: none;
outline: none;
transition: .4s ease-in-out;
cursor: pointer;
}
.reset-btn:hover{
background: red;
color: #fff;
}
.start-btn{
display: block;
font-family: 'Roboto', sans-serif;
font-size: 25px;
width: 150px;
background: #eee;
margin: 0 10px;
padding: 10px 30px;
text-align: center;
border-radius: 5px;
border: none;
outline: none;
transition: .4s ease-in-out;
cursor: pointer;
}
.start-btn:hover{
background: #0096ff;
color: #fff;
}<!DOCTYPE html>
<html>
<head>
<title>Countdown Timer</title>
<link href="https://fonts.googleapis.com/css2?family=Lato:ital@0;1&family=Roboto:ital@0;1&display=swap" rel="stylesheet">
<link rel="stylesheet" type="text/css" href="main.css">
</head>
<body>
<header id="header">
<div class="logo">
<h1 id="title">
Countdown Timer
</h1>
</div>
</header>
<main id="main">
<div class="container">
<div class="countdown-container">
<h1 id="title">
10 Minute Timer
</h1>
<span id="time">10:00</span>
</div>
<div class="function-buttons">
<button class="reset-btn" id="btn-reset">
Reset
</button>
<button class="start-btn" id="btn-start">
Start
</button>
</div>
</div>
</main>
<script src="app.js"></script>
</body>
</html>
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